Tool-holder.



A. E HSENMANN.

TOOL HOLDER,

APPLICATIUH man FB.16,19I7.

Patented July 31, 1917.

Flq. 4

fig, 2

Anion 5. f/isenmann Inventor Witness:

Uifiag ie'tomay W "M M ATENT FFICE.

ANTON E. EISENMANN, OF HAMILTON, OHIO, ASSIGNOR 0F ONE-HALF TO LOUIS WEIS, OF HAMILTON, OHIO.

TOOL-HOLDER.

Application filed February 16, 1917.

To all whom it may concern Be it known that I, ANTON E. EISEN- MANN, a citizen of the United States, residing at Hamilton, Butler county, Ohio, have invented certain new and useful Improve ments in Tool-Holders, of which the following is a specification.

This invention pertains to toolholders employed on machine tools, the toolholder being of that class in which the tool is put into clamped connection with a T-slotted tool-block in such manner that the tool, be fore being clamped to the tool-block, may be angularly adjusted. In the commoner form of toolholders employed in American machine tool practice, a mortised toolpost serves as a means for clamping the tool and as the pivot on which the tool may be angularly adjusted, the toolpost thus serving as a clamping-member for the tool and as the pivot on which it may be angularly adjusted. In somewhat similar toolholders, often spoken of as English toolholders, and much employed in Europe, the tool does not pass through the member providing for the pivotal adjustment but is disposed and clamped alongside that member. I illustrate my in vention in a toolpost of the American type.

The invention will be readily understood from the following description taken in connection with the accompanying drawing in which Figure 1 is a side elevation of the improved toolholder;

Fig. 2 a horizontal section of the same in the plane of line a of Figs. 1 and 3:

Fig. 3 a vertical section of the same in the plane of line b of Figs. 2 and l: and

Fig. 4 a bottom view of the subcollar.

In the drawing 1, indicates the usual tool-block:

2, the usual T-slot in the top thereof:

3, the usual American mortised tool-post:

4, the usual T-shaped head on the lower end of the tool-post engaging the T-slot in the tool-block:

5, a sub-collar surrounding the tool-post and resting on the top of the tool-block:

6, a rib projecting downwardly from the sub-collar and fitting into the slot in the tool-block so that the sub-collar is incapable of angular motion on the tool-post:

7, a super-collar surrounding the tool-post and resting on the sub-collar:

8, cooperating radial serrations on the Specification of Letters Patent.

Patented July 31, 1917.

Serial No. 148,957.

contiguous faces of the super-collar and sub-collar, these serrations being formed with sharp edges and angular sides and seriung to normally prevent. the angular movement of the super-collar on the subcollar, while permitting angular adjustment to be made when the super-collar is elevated sufliciently to disengage the serrations:

9, a groove formed diametrically in the top of the super-collar, in line with the mortise in the tool-post, and of a width sufliclent to accommodate the tool, the floor of this groove being formed on an upwardly concave curve:

10, the socalled wedge, seating in the groove 9 of the super-collar and passing through the mortise in the tool-post with its top below the top of the super-collar, the lower surface of this wedge being convex to fit the concavity of the floor of the groove, and the top of the wedge being preferably serrated or roughened to form a biting seat for the tool:

11, transverse serrations on the floor of the groove in the super-collar and on the bottom of the wedge: and

12, the usual mortise through the toolpost.

When the tool-holding parts are in the position indicated in the drawing and a tool is clamped in the tool-post, the tool will be level and lie in a plane at right angles to the slot in the tool-block. By adjusting the wedge, in the usual manner, the point of the tool may be raised or lowered before the tool is clamped and the serrations 11 prevent downward movement of the point of the tool. When the tool is clamped in place its point cannot shift sidewise owing to the engagement of the sides of the body of the tool with the side walls of the slot inthe super-collar. But, before clamping the tool, the super-collar may be raised to free the serrations 8 and to permit it to be adjusted angularly upon the subcollar, thus giving a horizontal angular position to the tool, and when it is clamped in place its angular position canshifting of the SHb-(Olltll' with reference to the toolbloclr. hen the super-collar is being adjusted angularly upon the sub-collar, to give angular position to the tool, the toolpostturns in the tool-block in the usual manner and the sharp character of the teeth prevents the lodginent of the super-collar at points between the step by step adjustments, the angular sides of the teeth preventing any possibility of their angular shifting with reference to each other after adjustment.

1 claim 1. In a tool-holder, a perforated sub-collar having upon its lower surface a projectingrib and provided upon its upper surface with radial serrations formed of teeth \vith'sharp edges and angular sides, suh stantially as set forth. 7

2. A structure as specified in claim 1 in combination With a tOOll')lOCl provided with a T-slot in which the rib of the subcollar may slide, a perforated super-collaradapted to give support to a tool and provided upon its lower surface With radial.

Gopies of this patent may be obtained for serrations cooperating with the serrations of the sub-collar, and a clamping pivotnieinber passing through the perforations in the tivo collars and into the slot of the tool-block and angularly movable with reference to the tool-block and sub-collar, substantially as set forth. 7

3. A structure as specified in claim 2- in which the pivot-member is transversely niortised and in which the upper surface of the super-collar is grooved in line with the mortise of the pivot-nieinl)er substantially as set forth.

i. A structure as specified in claim 3 in which the floor of the groove in the super-collar is concave and transversely serrated in combination with a Wedge seated in the groove of the super-collar and having its under surface transversely serrated, substantially as set forth.

ANTON E. EI SENMANN.

Witnesses:

M, S. BELDEN, I CHARLES VoLLnnEcnT.

five cents each, by addressing the Commissioner of IEatents Washington, D. G. 

